deps: every crate to its latest version, wgpu 28 -> 30

`cargo upgrade --incompatible` in each of the nine workspaces here, then
`cargo update`. Most of it is version numbers only -- log, winit,
bytemuck, image, tokio, libc, android_logger, proc-macro2/quote, and syn
2 -> 3 with no source change. The wg-app-link submodule's twelve
dependencies were already at their latest majors, so that shared
repository needs no commit.

wgpu 28 -> 30 (and pollster 0.4 -> 1.0) is the part with API in it:
bind-group and vertex-buffer slots are optional now, `Instance::new`
takes an owned `InstanceDescriptor` carrying the platform's display
handle (the desktop passes winit's, since wgpu wants it for a GLES
surface presented on Wayland -- which is what this machine's fallback
produces; Android passes none), `RequestAdapterOptions` and
`SurfaceConfiguration` each gained a field kept at its historical value,
`get_current_texture` answers with an enum instead of a Result, and
`present` moved onto the queue.

The one that would not have failed at compile time: naga now requires
`@interpolate(flat)` on integer varyings, so `shader.wgsl`'s three u32
outputs were rejected at `create_shader_module` -- an abort on the device
rather than a build error. Flat is the only interpolation an integer can
have, so this states what the hardware already did.

Checked: build, clippy, fmt and tests in all nine workspaces (iris 196,
server 160); layer 2 screenshots on Vulkan and on force-gles, identical;
the arm64 release APK builds and the x86_64 bench ran a full
fling/stream/type/keyboard cycle on the emulator's GLES adapter.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

docs/DECISIONS.md

@@ -5,6 +5,25 @@ they can be judged and reversed later. Detail lives in RUST.md (and IRIS.md
 for iris API changes); this file is only the summary. Newest first. Items
 marked **DEFERRED** are ones the agent chose not to decide alone.
 
+## 2026-09-08 (every crate to its latest version, wgpu 28 -> 30)
+
+At Iris's request. RUST.md's "Every crate to its latest version" box has
+the full list and the migration.
+
+- **wgpu 30 taken now rather than pinned at 28.** Two majors of API
+  change, all mechanical (instance descriptor, optional bind-group and
+  vertex-buffer slots, `Queue::present`, a `CurrentSurfaceTexture` enum),
+  and one that would have been a startup abort on a device rather than a
+  compile error: naga now demands `@interpolate(flat)` on the shader's
+  integer varyings. Verified on both backends before this was called
+  done, since a renderer that compiles proves nothing.
+- **The desktop instance now carries winit's display handle.** wgpu 30
+  asks for it when a GLES surface will be presented on Wayland, which is
+  what this machine's Vulkan-to-GLES fallback produces. Android passes
+  none: its surface comes from a `NativeWindow`.
+- **`syn` 2 -> 3, `pollster` 0.4 -> 1.0** with no source change in
+  `iris/macro` or anywhere else.
+
 ## 2026-09-08 evening (the fling is shared; a cancel is not a release)
 
 From Iris's four-item phone report; RUST.md's "2026-09-08 (evening)" box